ON-LINE PRODUCTION CONTROL OF CAST IRONS BY MEASURING THE SURFACE TENSION OF THE BASE TREATED IRON

摘要

A method for producing cast irons having a certain desired morphology of graphite crystals and containing graphite shape modifiers and/or inoculants, according to which: a) a sample quantity of the molten iron is taken from the batch of molten iron; b) the surface tension of the sample is determined; c) the surface tension of the sample is compared with the surface tensions of batches of molten iron that are known to solidify as different forms of cast irons; and finally d) if the surface tension of the sample deviates from the surface tension that is known to solidify as the desired form of cast iron by more than a predetermined value, correcting the concentrations of graphite shape modifiers and/or inoculants in a known way.